The `C_AsyncJoin` return parameters `ulData`

[Jakuje]

My reading of the specs is that this function finalizes the async operation and the function should set the returned lenght:

ulData is the length in bytes of the data.

But given that its just a ulData, not a pointer, the module can not report back the length. Or do I miss something or misunderstand the API?

In any case, to be consistent with the existing API, the parameter should really be a ulDataLen.

[rjrelyea]

I'll verify this.